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[Z06] active handling & tire diameter???

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Old Dec 11, 2011 | 09:24 PM
  #1  
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Default active handling & tire diameter???

Original front tires are p265/40zr-17 with an outside diameter of 25.40"
The rear tires are p295/35zr18 with an outside diameter of 26.10"
Rotational speed of the front and rear are different at constant car velocity.
Questions are:
1. Does the active handling have the diameter difference programmed in it's memory or can it learn a new outside tire front to rear tire ratio?
2. If I install the same outside diameter tires front and rear will the active handling system keep trying to correct?

Thanks.
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Old Dec 11, 2011 | 09:30 PM
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I have Nitto NT555 II 275/40/17's and 305/35/18's on the stock wheels and I had no problems at Road Atlanta and the handling system.
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Old Dec 11, 2011 | 11:43 PM
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Originally Posted by californiajim
Original front tires are p265/40zr-17 with an outside diameter of 25.40"
The rear tires are p295/35zr18 with an outside diameter of 26.10"
Rotational speed of the front and rear are different at constant car velocity.
Questions are:
1. Does the active handling have the diameter difference programmed in it's memory or can it learn a new outside tire front to rear tire ratio?
2. If I install the same outside diameter tires front and rear will the active handling system keep trying to correct?

Thanks.
You can see the stock delta between front and rear is about .75", and it is very well documented that if you drop that delta below .5", you're highly likley to experience TC issues because the car thinks the rear tires are spinning faster due to loss of traction.
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Old Dec 12, 2011 | 12:08 AM
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Originally Posted by JeremyGSU
I have Nitto NT555 II 275/40/17's and 305/35/18's on the stock wheels and I had no problems at Road Atlanta and the handling system.
You ran with traction control ON?!?!
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Old Dec 12, 2011 | 12:30 AM
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Originally Posted by jpac
You ran with traction control ON?!?!
Most likely competition mode...AH is on but TC is disabled.
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Old Dec 12, 2011 | 11:56 AM
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Originally Posted by MTPZ06
Most likely competition mode...AH is on but TC is disabled.
My bad. I ran with competitive mod on so I guess I don't know if traction control would be effected with the different tire sizes or not.
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